[PATCH rdma-next v1] RDMA/restrack: Don't rely on uninitialized variable in restrack_add flow

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From: Leon Romanovsky <leonro@xxxxxxxxxxxx>

The restrack code relies on the fact that object structures are zeroed at
the allocation stage, the mlx4 CQ wasn't allocated with kzalloc and it
caused to the following crash.

[  137.392209] general protection fault: 0000 [#1] SMP KASAN PTI
[  137.392972] CPU: 0 PID: 622 Comm: ibv_rc_pingpong Tainted: G        W        4.16.0-rc1-00099-g00313983cda6 #11
[  137.395079] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-2.fc27 04/01/2014
[  137.396866] RIP: 0010:rdma_restrack_del+0xc8/0xf0
[  137.397762] RSP: 0018:ffff8801b54e7968 EFLAGS: 00010206
[  137.399008] RAX: 0000000000000000 RBX: ffff8801d8bcbae8 RCX: ffffffffb82314df
[  137.400055] RDX: dffffc0000000000 RSI: dffffc0000000000 RDI: 70696b533d454741
[  137.401103] RBP: ffff8801d90c07a0 R08: ffff8801d8bcbb00 R09: 0000000000000000
[  137.402470] R10: 0000000000000001 R11: ffffed0036a9cf52 R12: ffff8801d90c0ad0
[  137.403318] R13: ffff8801d853fb20 R14: ffff8801d8bcbb28 R15: 0000000000000014
[  137.404736] FS:  00007fb415d43740(0000) GS:ffff8801e5c00000(0000) knlGS:0000000000000000
[  137.406074] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  137.407101] CR2: 00007fb41557df20 CR3: 00000001b580c001 CR4: 00000000003606b0
[  137.408308] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  137.409352] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  137.410385] Call Trace:
[  137.411058]  ib_destroy_cq+0x23/0x60
[  137.411460]  uverbs_free_cq+0x37/0xa0
[  137.412040]  remove_commit_idr_uobject+0x38/0xf0
[  137.413042]  _rdma_remove_commit_uobject+0x5c/0x160
[  137.413782]  ? lookup_get_idr_uobject+0x39/0x50
[  137.414737]  rdma_remove_commit_uobject+0x3b/0x70
[  137.415742]  ib_uverbs_destroy_cq+0x114/0x1d0
[  137.416260]  ? ib_uverbs_req_notify_cq+0x160/0x160
[  137.417073]  ? kernel_text_address+0x5c/0x90
[  137.417805]  ? __kernel_text_address+0xe/0x30
[  137.418766]  ? unwind_get_return_address+0x2f/0x50
[  137.419558]  ib_uverbs_write+0x453/0x6a0
[  137.420220]  ? show_ibdev+0x90/0x90
[  137.420653]  ? __kasan_slab_free+0x136/0x180
[  137.421155]  ? kmem_cache_free+0x78/0x1e0
[  137.422192]  ? remove_vma+0x83/0x90
[  137.422614]  ? do_munmap+0x447/0x6c0
[  137.423045]  ? vm_munmap+0xb0/0x100
[  137.423481]  ? SyS_munmap+0x1d/0x30
[  137.424120]  ? do_syscall_64+0xeb/0x250
[  137.424984]  ? entry_SYSCALL_64_after_hwframe+0x21/0x86
[  137.425611]  ? lru_add_drain_all+0x270/0x270
[  137.426116]  ? lru_add_drain_cpu+0xa3/0x170
[  137.426616]  ? lru_add_drain+0x11/0x20
[  137.427058]  ? free_pages_and_swap_cache+0xa6/0x120
[  137.427672]  ? tlb_flush_mmu_free+0x78/0x90
[  137.428168]  ? arch_tlb_finish_mmu+0x6d/0xb0
[  137.428680]  __vfs_write+0xc4/0x350
[  137.430917]  ? kernel_read+0xa0/0xa0
[  137.432758]  ? remove_vma+0x90/0x90
[  137.434781]  ? __kasan_slab_free+0x14b/0x180
[  137.437486]  ? remove_vma+0x83/0x90
[  137.439836]  ? kmem_cache_free+0x78/0x1e0
[  137.442195]  ? percpu_counter_add_batch+0x1d/0x90
[  137.444389]  vfs_write+0xf7/0x280
[  137.446030]  SyS_write+0xa1/0x120
[  137.447867]  ? SyS_read+0x120/0x120
[  137.449670]  ? mm_fault_error+0x180/0x180
[  137.451539]  ? _cond_resched+0x16/0x50
[  137.453697]  ? SyS_read+0x120/0x120
[  137.455883]  do_syscall_64+0xeb/0x250
[  137.457686]  entry_SYSCALL_64_after_hwframe+0x21/0x86
[  137.459595] RIP: 0033:0x7fb415637b94
[  137.461315] RSP: 002b:00007ffdebea7d88 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[  137.463879] RAX: ffffffffffffffda RBX: 00005565022d1bd0 RCX: 00007fb415637b94
[  137.466519] RDX: 0000000000000018 RSI: 00007ffdebea7da0 RDI: 0000000000000003
[  137.469543] RBP: 00007ffdebea7d98 R08: 0000000000000000 R09: 00005565022d40c0
[  137.472479] R10: 00000000000009cf R11: 0000000000000246 R12: 00005565022d2520
[  137.475125] R13: 00000000000003e8 R14: 0000000000000000 R15: 00007ffdebea7fd0
[  137.477760] Code: f7 e8 dd 0d 0b ff 48 c7 43 40 00 00 00 00 48 89 df e8 0d 0b 0b ff 48 8d 7b 28 c6 03 00 e8 41 0d 0b ff 48 8b 7b 28 48 85 ff 74 06 <f0> ff 4f 48 74 10 5b 48 89 ef 5d 41 5c 41 5d 41 5e e9 32 b0 ee
[  137.483375] RIP: rdma_restrack_del+0xc8/0xf0 RSP: ffff8801b54e7968
[  137.486436] ---[ end trace 81835a1ea6722eed ]---
[  137.488566] Kernel panic - not syncing: Fatal exception
[  137.491162] Kernel Offset: 0x36000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)

Fixes: 00313983cda6 ("RDMA/nldev: provide detailed CM_ID information")
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
---
 drivers/infiniband/core/restrack.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/core/restrack.c b/drivers/infiniband/core/restrack.c
index e1d9934d6e81..91bf5df11608 100644
--- a/drivers/infiniband/core/restrack.c
+++ b/drivers/infiniband/core/restrack.c
@@ -113,13 +113,12 @@ void rdma_restrack_add(struct rdma_restrack_entry *res)
 	if (!dev)
 		return;

+	res->task = NULL;
 	if (res_is_user(res)) {
-		if (!res->task)
-			rdma_restrack_set_task(res, current);
+		rdma_restrack_set_task(res, current);
 		res->kern_name = NULL;
 	} else {
 		set_kern_name(res);
-		res->task = NULL;
 	}

 	kref_init(&res->kref);
--
2.14.3

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